Light-regulator for projecting moving pictures



F. W. HOCHSTETTER.

LIGHT REGULATOR FOR PROJECTING MOVING PICTURES.

APPLICATION FILED MAR 24, 1919.

a nveM/coz Patented Jan. 4, 1921.

I STETTER, a citizen of the United States, and

a so

UNITED STATES PATENT omen- FREDERICK W. HOCHSTETTER, OF NEW YORK; N. Y.,ASSIGNOR TO HQ PATENTS AND PROCESSES COMPANY, INC., A CORPORATION OF NEWYORK.

LIGHT-REGULATOR FOR PROJECTING MOVING PICTURES.

Specification of Letters Patent.

Application filed March 24, 1919. Serial No. 284,862.

To all whom it may con cern:

Beit'known that I, FREDERICK W.. HOCH- a resident of New York, countyandState of New York, have invented certain new and useful Improvements inLight-Regulators for Projecting Moving Pictures, of which the followingis a full, clear, and exact specification. i

This invention relatesto a class of devices adapted to be used inconjunction with moving picture-machines.

My invention has for its object primarily 4 to provide-a simple andefficient device deunif ormly illuminated by the utilization of thedirect rays oflight passing through the condensers of the machine aswell as utilizing partially the angularly directed rays of li ht, andwhich is of a form adapted to be a justed so that the light employed inrejecting' the pictures .ma be regulate to meet VariOusdiStances. heinvention con sists essentially of an apertured diaphragm adapted to bearranged in the path of projection of the pictures of a moving pictureprojecting machine so that the direct rays of light'o erative on thepictures will pass through t e" aperture, and adjustable on thediaphragm is.a slide or-element for cutting out the marginal rays oflight.

Another object of the invention is to pro vide a reflector whereby partof the angularly directed rays ofthe light will'be deflected so as tomerge with the direct rays of light prior to passage through thediaphragm.

A practical embodiment of the invention is represented in theaccompanying drawing forming a part of this specification in whichsimilar characters of reference indicate cor respondi parts in all the.views', the-said inventioii fiieing more fully describedhereinafte'r,and then ointed out in the claims at the end of the escription. J

In the drawing, Figure 1 is an elevation of a-moving picture projectingmachine showing the manner of emfloying ncomunctio'n therewith one form0 device embodying my invention. l

Fig. 2 is an enlarged lo itudinal vertical section taken through t elens barrel of themachine and'also through the diaphragm of the deviceas applied thereto.

Fig, 3 is a perspective'view of the adjustable element used in thedevice.

Patented Jan. 4., 1921,.

Fig. "4: is a rear elevation'of the diaphragm used in the device.

Fig. 5 is a section taken on the line V V of-Fig. 4, and

Fight is a section taken on the line VI- of Fig. 5.

The device or regulator has a diaphragm, or plate 10 of a form and size.to adapt it to be disposed interiorly of the lens barrel, as

11, of a moving picture projecting machine, signed to be employed on a'moving picture projecting machine whereby all parts of thepictures whenprojected on a screen Wlll be from one face of the diaphragm .10 at itsperiphery is a flange, or wall 16 of a dimen- 'sion similar to the sizeof the diaphragm for removably fittingclosely the interior of the lensbarrel-of the, machine. Extending interiorly' of the flange 16 from thediahphragm 10 may be two parallel spaced guides, or grooved bars 17 and18 arranged transversely of the diaphragm one'below and one above theaperture 15. of the diaphragm, and through the flange of the diaphragm'are two registered vertically disposed slots 19 and 20 which are also inregisterwith the space between the grooves of the guide bars 17 and 18.Through opposite parts of the lens barrel of the machine may beregistered vertically disposed pairs of slots 21 and 21 one pair betweenthe lenses and one pair between the machine and the rear lens. Y

When the diaphragm 10 with its flange is applied interiorlyof the lensbarrelof the machine these parts are arranged so that the slots 19 and20 of the fiange'of the device willbe registeredwith one pair of theslots 21 and 21? of the lens barrel, as occasion requires, to allow aslide, or element, as 22, to be adjustably inserted through the re'gis--tered slots of the lens barrel as well as through the .slots of theflange of the diaphragm for cutting out the marginal rays of light fromthe condenser atgthe rear of the device by causing the passage throughthe aperture 15 of the diaphragm to be contrast between the varied indimension. The adjustable element, or slide 22 has a substantiallyrectagular body portion 23 of a length considerably longer than thewidth of the lens barrel of the machine, and through the body portion ofthe adjustable slide are spaced openings 24:, 25, 26 27. All of theseopenings are preferably approximately rectangular to conform to theusual shape of thepictures of a film. These openings of the slide varyin sizes, the opening 24 being the smallest, the opening 25 beinglarger, the opening 26 being still larger, and the opening 27 being thelargest. The openings are provided in the slide as well as beingrelatively arranged so that when the body of the slide is according'yadjusted in the lens barrel of the macline and also adjusted intheguides 17 and 18 of the diaphragm of the device one of the openings ofthe slide may be registered with t e aperture 15 of the diaphragm, andto permit the slide to be conveniently moved projecting from the ends ofits body portion 23 are handles, as 28 and 29.

When the pictures from a moving picture film are projected on a screenpositioned at a comparatively short distance from the projectingmachine, the slide is adjusted so that its opening 24 will be inregister with the aperture 15 of the diaphragmof the device as well asbein in the optical axes of the lenses of the mac ine, and when theprojection of the pictures is for a longer distance the slide isadjusted so that its opening 25 will bein register with the aperture ofthe diaphragm 10. When the throw of the pictures is for still longerdistances. the slide is adjusted in a like manner so that its apertures26 and 27 will be respectively in register with the aperture of thediaphragm. By properly proportioning the dimensions of these openingsaccording to the variations of distances of the screen from theprojecting machine only such of the direct rays of light operativethrough the condenser or condensers will be admitted through the passa eof each opening as will evenly illuminate the pictures appearing on thescreen as well as producing a pronounced high lights and shadows of theobjects in. the pictures.

While this use of the slide 22 will cause a portion of the marginal raysof the light to be cut-out, the angularly directed rays may be partiallyused in instances by providing a reflector, as 28. The reflector may bein the form of a mirror mounted on the inner surface of the flange 16 ofthe diaphragm of the device, or the reflector may be provided by makingthis flange of metal with a highly polished or silvered inner surface.The angularly directed rays of the light 0" erative through thecondenser at the rear of the device will be received in the reflectorfor being deflected so as to merge with the direct rays of the li ht forprojection through the slide of the evice, and in this manner these rayswill be advantageously bodied the preferred form of my invention,

but I do not wish to be understood as limiting myself thereto, as Iam-aware that modifications may be made therein without departing fromthe principle, or sacrificing any 'of the advantages of this invention,therefore I reserve to myself the right to make such changes as fairlyfall within the sco e thereof.

aving thus described my invention, I claim as new and desire to secureby Letters Patent 1. The combination with a lens barrel having a lensremovably secured within one end thereof by means of a bushing having'aninternal configuration similar-to the internal configuration of thebarrel inwardly of the bushing and having pairs of registered side slotstransversely therethrough forwardly of and rearwardly of said lens, ofan apertured diaphragm removably positionable within the barrel at apoint 1nwardly of the lens or within the securing bushing at the outerside of lens, and a slide adjustable on the diaphragm through the slotsof the lens barrel and having a plurality of spaced apertures of varyingsize for being separately registered wit the aperture of the diaphragmwhereby the passage through the'diaphragm may be varied in dimension.

2. The combination with a lens barrel having a lens removably securedwithin one end thereof by means of a bushing having an internalconfiguration similar to the internal configuration of the barrelinwardly of the bushing and having pairs of registered side slotstransversely therethrough forwardly of and rearwardly of said lens, ofan apertured diaphragm removably positionable within the barrel at apoint inwardly of the lens or within the securing bushing at the outerside of the lens, a sii 1e adjustable on the diaphragm through the slotsof the lens barrel and having a plurality of spaced apertures of varyingsize for being separately registered with the aperture of the diaphragmwhereby the passage through the diaphragm may be varied in dimension,and a reflector on the diaphragm for deflecting angularly directed rays.

3. The combination with a lens barrel having a lens removably securedwithin one end thereof by means of a bushing having an internalconfiguration similar to the internal configuratmn of the barrelinwardly of the bushing'and having pairs of registered side slotstransversely therethrough the slots of the lensbarrel and having aplurality of spaced apertures of v varying size for being separatelyregistered with the aperture of the diaphragm whereby the passagethrough the diaphragm may be varied in dimension, said diaphragm havinga marginal flange provided with slots for registration with the slots ofthe lens barrel.

4. The combination with a lens barrel having a lens 'removably securedwithin one end thereof by means of a bushing having an internalconfiguration similar to the internal configuration of the barrelinwardly of the bushing and having pairs of registered side slotstransversely therethrough forwardly of and rearwardly of said lens, ofan apertured diaphragm removably positionable within the barrel at apoint inwardly of the lens or within the securing bushing at the outerside of the lens, a slide adjustable on the diaphragm through the slotsof the lens barrel and having a plurality of spaced apertures of varyingsize for being separately registered with the aperture of the diaphragmwhereby the passage through the diaphragm may be varied in dimension,said diaphragm having a marginal flange provided with slots forregstration-with the slots of the lens barrel, and said marginal flangehaving a reflecting inner surface so as to deflect angularly directedrays of light.

5. The combination with a lens barrel having a pair'of spaced lensesremovably secured Within the ends thereof by means of bushings havinginternal configurations similar to the internal configuration of thebarrel between the lenses and having pairs of registered side slotstransversely therethrough between ,the lenses and outwardly. of one ofthe lenses, of an apertured diaphragm removably, positionable within thebarrel at a point between the lenses or within the securing bushings atthe outer side of either of the'lenses, and a slide adjustable on thediaphragm through the slots of the lens barrel and having a plurality ofspaced apertures of varying sizes for being separately registered withthe aperture of the diaphragm whereby the passage through the diaphragmmay be varied in dimension.

This specification signed I and witnessed this 22 day of March, A. D.1919.

I FREDERICK w. nocusnarrm. VVitnessr FREDERICK CBYER.

